In C++11 an rvalue reference is a reference variable that can refer only to temporary objects.

Name: In C++11 an rvalue reference is a reference variable that can refer only to temporary objects.
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Rvalue references in C++11 can only refer to temporary objects, which are expressions that are not capable of being assigned to, like literals or the result of a function call. This allows for more efficient transfer of ownership or "moving" of objects rather than copying them.

In C++11 an Rvalue Reference Is a Reference Variable That